added missing parameter

[olexiyb]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

https://github.com/tokenika/eosfactory/blob/master/docs/tutorials/05.InteractingWithPublicTestnet.md

The test did not work from documentation above

python3 tests/tic_tac_toe.py mykylin
and failing with missing parameter error

• What is the current behavior? (You can also link to an open issue here)

Not working test

• What is the new behavior (if this is a feature change)?

The test works

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)

No

• Other information:

[stefanzarembinski]

OK, than you.